Abstract: A golf club shaft includes a shaft having a tubular wall delimiting an interior space. The shaft includes a first end coupled with a head and a second end coupled with a grip. A light vibration-absorbing member is mounted in the interior space of the shaft. At least a portion of the light vibration-absorbing member is in contact with the tubular wall for absorbing vibration that results from striking a golf ball and that is transmitted from the head to the shaft.

Abstract: A golf club head includes a golf club head body having a toe and an engaging portion to which a striking plate is mounted, a hosel mounted to a side of the golf club head body, and a heel between the hosel and the engaging portion of the golf club head body. The heel includes a hole for reducing a weight of the heel, thereby shifting a center of gravity of the golf club head toward the toe of the golf club head body and increasing an inertial momentum of the golf club head.

Abstract: A golf club head includes a golf club head body and a weight member mounted in a recession of the golf club head body. The weight member includes at least one compartment for receiving a filling material. The weight member is mounted in the recession of the golf club head body before a brazing process for bonding the weight member with the golf club head body. During the brazing process, the filling material is melted and fills a gap between the weight member and walls delimiting the recession of the golf club head body to thereby increasing bonding strength between the weight member and the walls delimiting the recession of the golf club head body.

Abstract: A golf club head includes a first portion forming a part of a head body of the golf club head and a second portion forming another part of the head body. The first portion is made of a first metal material and includes an abutting portion. The second portion is made of a second metal material and includes an abutting portion. At least one inclined or arcuate surface for friction welding is formed on the abutting portion of the first portion. The inclined or arcuate surface for friction welding provides the abutting portion of the first portion and the abutting portion of the second portion with improved bonding strength and increased joining area when joining the first portion and the second portion together by welding friction to form a golf club head product. A method for manufacturing a golf club head by friction welding is also disclosed.

Abstract: A golf club head includes a golf club head body having a connecting groove and a filling space, and a striking plate having an annular upright bent wall and a connecting end. In assembling, the connecting end of the annular upright bent wall of the striking plate is initially inserted into the connecting groove of the golf club head body so that an intensified structure is provided. The filling space of the golf club head body is further filled with a braze material. In brazing, the braze material contained in the filling space of the golf club head body is melted and thus filled within a clearance between the connecting groove of the golf club head body and the connecting end of the striking plate to form a welded layer.

Abstract: A welding method for manufacturing the golf club head includes the steps of: prefabricating a first club head member having a first welding surface, and a second club head member having a second welding surface; aligning the first welding surface of the first club head member with the second welding surface of the second club head member; welding the first welding surface of the first club head member to the second welding surface of the second club head member to form a welding portion by means of magnetic pulse welding; and surface finishing the first club head member, the second club head member and the welding portion to finish a product of the golf club head.

Abstract: A coating includes a bottom paint layer coated on a surface of the golf club head and an elastomeric resin layer coated on the bottom paint layer, with the elastomeric resin layer containing quenchers. When light beams are incident on the elastomeric resin layer, the quenchers provide a double scattering effect for the light beams passing therethrough and thus reduce the intensity of the light beams reflected from the bottom paint layer.

Abstract: A golf club head includes a club head body, a striking plate, and a bonding layer. The striking plate includes an engaging portion that is engaged with an engaging portion of the striking plate. One of the engaging portion of the striking plate and the engaging portion of the club head body includes at least one groove, and the other includes at least one protrusion. The bonding layer is applied between the engaging portion of the club head body and the engaging portion of the striking plate. The groove and the protrusion of the engaging portion of the club head body and the engaging portion of the striking plate increase a contact area between the club head body and the striking plate, thereby improving a bonding strength between the club head body and the striking plate.

Abstract: A dynamic balance-testing method for a golf club shaft in accordance with the present invention comprises steps of: fixing a first end of a golf club shaft; measuring reacting forces of a constant displacement of a second end of the golf club shaft in a plurality of predetermined angular directions with respect to an axis of the golf club shaft; calculating a minimum difference of reacting force of any two opposite directions; and determining a preferred balance direction according to the minimum difference of reacting force and thus selecting a preferred striking direction perpendicular to the balance direction of the golf club shaft for assembling.

Abstract: A golf club head includes a casing with a front open end to which a striking plate is attached through a layer of brazing material that is formed between a rear surface of the striking plate and a frontmost end face of the casing. One of the striking plate and the front open end of the casing has an extension part which projects outward in a direction away from the opening. The extension part forms a shoulder with one of the first and second outer peripheral faces. During a brazing process, the brazing material is positioned against the shoulder externally of a clearance between the rear surface and the frontmost end face and is then melted to flow into the clearance through a capillary action.

Abstract: A method of making a golf club head is disclosed. A striking plate is attached to a front open end of a metal casing to cover an opening. The striking plate is placed over the front open end by contacting a rear surface of the striking plate with the front open end, thereby creating a clearance between the rear surface and the front open end. A brazing material is positioned on one of the rear surface and the front open end externally of and immediately adjacent the clearance. When the brazing material melts, it flows into the clearance through a capillary action, thereby forming a layer of brazing material between the rear surface and the front open end.

Abstract: A method for manufacturing a golf club head includes providing a body having an opening delimited by an inclined surface, providing a striking plate with an inclined surface, engaging the inclined surface of the striking plate with the inclined surface of the body, applying a force to the striking plate to tightly embed the striking plate in the opening of the body, moving a rotating pin along an engaging area between the striking plate and the body to proceed with friction welding, and surface finishing the engaging area between the striking plate and the body. For carrying out the method, a friction welding structure for a golf club head includes a body having an opening delimited by an inclined perimeter surface and a striking plate having an inclined perimeter surface.

Abstract: A weight member for a golf club head is made of a WMoNi alloy by powder metallurgy or a precision casting process. The WMoNi alloy includes tungsten 1-35 wt %, molybdenum 4-55 wt %, and nickel 25-95 wt %, and has a specific gravity ranging between 8.6 and 13.3. Molybdenum increases the density of the weight member and improves the rust-resisting property of the weight member. The tungsten, molybdenum, and nickel provide a uniform metallographic phase. Uniformity of polishing of the weight member is thus improved.

Abstract: In a combination of a club head body and a striking plate, the club head body includes an opening in a front end thereof, a perimeter delimiting the opening forming an inner engaging face. The striking plate includes a front face for striking a golf ball, the striking plate including an outer perimeter that forms an outer engaging face. The striking plate is received in the opening of the club head body. The inner engaging face and the outer engaging face together form a filler-receiving space for receiving a welding material. Further, the inner engaging face and the outer engaging face together form an abutting section that reliably retains the striking plate in place for a subsequent welding process.

Abstract: A golf club head includes a body having a cavity in a rear side thereof, a striking plate provided on a front side of the body, and a vibration-absorbing plate fixed in the cavity of the body and not in contact with the striking plate. The damping effect of the golf club head and gripping comfort are improved.

Abstract: A golf club head includes a first portion forming a part of the head body of the golf club head, a second portion forming another part of the head body of the golf club head, and an intermediate layer. The first portion, the second portion, and the intermediate layer are made of different materials. Each of the first portion and the second portion has an abutting portion, with the intermediate layer being positioned between the abutting portion of the first portion and the abutting portion of the second portion. The intermediate layer and the abutting portion of the first portion are joined together by friction welding, and the intermediate layer and the abutting portion of the second portion are joined together by friction welding, thereby forming a golf club head product.

Abstract: A golf club head includes a golf club head body, a striking plate mounted to a front side of the golf club head body, and a perimeter wall extending rearward along a perimeter of the golf club head body. At least one hole is defined in a toe of the perimeter wall to reduce the weight of the upper part of the golf club head body, thereby shifting the center of gravity of the golf club head downward toward the heel and thereby increasing the inertial moment of the golf club head.

Abstract: A golf club head includes a body having a cavity in a rear side thereof, a striking plate provided on a front side of the body, and a vibration-absorbing plate fixed in the cavity of the body and not in contact with the striking plate. The damping effect of the golf club head and gripping comfort are improved.

Abstract: A method for etching a metal surface of a golf club head includes coating a masking layer on a metal surface of a golf club head, illuminating the masking layer with laser beams to form windows of a predetermined pattern, etching areas of the metal surface exposed via the windows to form the predetermined pattern in the metal surface, and removing the masking layer. A predetermined patter is thus formed on a metal surface of the golf club head with improved etching accuracy, expedited etching procedure, improved etching effect, and reduced etching cost.

Abstract: A golf club head includes a golf club head body, a striking plate mounted to the golf club head body, a hosel mounted to a side of the golf club head body, and a heel between the hosel and the striking plate. The heel includes a compartment for reducing a weight of the heel, thereby shifting a center of gravity of the golf club head toward a toe of the golf club head body and increasing an inertial moment of the golf club head. A filling material may be filled in the compartment for absorbing vibrations generated as a result of striking a golf ball.